Biology - Online Test
Q1. The code AUG stands for
Answer : Option B
Explaination / Solution:
The start codon is the first codon of a messenger RNA (mRNA) transcript translated by a ribosome. The start codon always codes for methionine in eukaryotes and a modified Met (fMet) in prokaryotes. The most common start codon is AUG.
Q2. Hill reaction requires
Answer : Option A
Explaination / Solution:
The light dependent transfer of electrons by chloroplasts in photosynthesis that results in the cleavage of water molecule and liberation of oxygen is called Hill reaction. Hill reaction required ferrricynide.
Q3. The principle of exchange of gases at the lungs is :
Answer : Option A
Explaination / Solution:
The main function of the respiratory system is gaseous exchange. This refers to the process of Oxygen and Carbon Dioxide moving between the lungs and blood. Diffusion occurs when molecules move from an area of high concentration (of that molecule) to an area of low concentration. This occurs during gaseous exchange as the blood in the capillaries surrounding the alveoli has a lower oxygen concentration of Oxygen than the air in the alveoli which has just been inhaled.
Q4. Hybrid vigour is mostly due to
Answer : Option C
Explaination / Solution:
Hybrid vigour is mostly due to heterozygosity of traits. The hybrid contain genome from both the parents that make them more vigorous.
Q5. Wild animals :
i) Frequently breed in Zoos.
ii) Reproductive capacity is lowered if area of free movement is reduced.
i) Frequently breed in Zoos.
ii) Reproductive capacity is lowered if area of free movement is reduced.
Answer : Option D
Explaination / Solution:
Reproductive capacity of an animals is lowered if area of free movement is reduced. So, wild animals do not breed frequently in Zoos. So, statement i is wrong and ii is correct.
Q6.
Match the following :
| Column A | Column B |
| a) PTH | i) Mineralocorticoid |
| b) Cortisol | ii) Inhibiting hormone |
| c) Aldosterone | iii)Collip’s hormone |
| d) Somatostatin | iv) Glucocorticoid |
Answer : Option C
Explaination / Solution:
pituitary thyroid hormone is also called as collip’s hormone. Cortisol is called as glucocorticoid hormone. Aldosterone is called as mineralocorticoid and somatostatin is called as inhibiting hormone.
Q7. Which phylum has water vascular system as a characteristic feature?
Answer : Option C
Explaination / Solution:
The most distinctive feature of Echinodermata is the presence of water vascular system.
Q8. Sertoli cells present in the testis act as
Answer : Option D
Explaination / Solution:
Large pillar like cells in the germinal epithelium of the testis that support and nourish developing spermatozoa are Sertoli cells.
Q9. Which of the following is not obtained on hydrolysis of nucleic acid?
Answer : Option D
Explaination / Solution:
Hydrolysis of nucleic acid (DNA and RNA) produces pentose sugar ( ribose or deoxyribose) purine and pyrimidine. Phosphoric acid is not released on hydrolysis of DNA or RNA.
Q10. Which among the following occurs in pair?
Answer : Option B
Explaination / Solution:
Both gene and chromosome occurs in pair and segregate during gamete formation by reduction division or meiosis.
